ZWEILUTCHINEN, 2nd May, 1887. 
OF SUNLIGHT THROUGH THE EARTH’S ATMOSPHERE. 25 
O 
o 
CO 
ce 
o 
3 
S ^ 
O CD 
li "3 
Q.S 
lO 
CO 
CO 
OJ 
o 
o 
Oti 
00 
i) 
lO 
CO 
6 ^ 
o 
‘ o 
c; O 
<1 
.0 o 
w 
O 
X 
o 
o 
CO 
CO 
00 
oi 
o 
CO 
00 
iO 
Ol 
o 
o 
c 
*3 “ 
3 
c o 
CQ 
<D ^ 
O 
'+^ . 
1— 1 ^ 
M iH 
o 
o oq o 
CO CO CM 
CO o 
00 00 
oi 01 CO 
o o o 
01 01 1-0 
CO CO 00 
o 
lO lO 
oi 
Equivaleii 
in 
intensity. 
'M O 1 
o cc 1 
rH 
1-0 oq o 
CO CO ‘O 
CO 
CO O I 
CO 1 
rH 
t—i oq IN. 
IC o o 
i-H oq 
I— 1 oq o 
CO CO 
t—1 
27 
100 
oq 
Depth of 
tint. 
White 
= -100. 
lO ip . 
b ii 1 
I-N. 
1C ic oq 
cb ^ Ci 
CO 00 
76 
36’5 
iC 
C5 O O 
CO ic oq 
1-0 IC 
^ cb lo 
CO lO CO 
88 
50-5 
90 
Ail- 
thickness, 
that of ZU 
being 1. 
1-17 
1-23 
1-35 
1-98 
1 
nH 
ip 
oq 
CO 
lo 
CO 
cc 
Barometer, 
pressure 
in inches. 
cb 
oq 
Time. 
12.0 
1 
1.25 
2.18 
4.8 
4.50 
5.30 
6.25 
1 O 
C •<-< 'T5 
X S o 
lO o o 
f-H oq 
IC o o 
1—1 CO 
1 
lo o o 
cq cq 
IC o o 
1 — 1 oq 
1 
iO> o o 
t-H oq 
lO o 
OJ 
20 
No. of 
exposure. 
r-t cq CO 
lO to 
i>- 
00 05 o 
^ oq CO 
; rH rH 
14 
lO CO IN 
1—1 1—i r—1 
00 
rH rH 
20 
MDCCCXCIII.—A. 
